Lathe attachment for turning irregular profiles



Och 1927" J. L. MATTHEWS LATHE ATTACHMENT FOR TURNING IRREGULAR PROFILES Filed Dec. 7, 1926 3 Sheets-Sheet;

' Oct. 25, 1927. 1,646,758

7 J. L. MATTHEWS LATHE ATTACHMENT FOR TURNING IRREGULAR PROFILES Fil ed Dec. 7. 1926 s Sheets-51196142 0d 27 J. L. MATTHEWS LATHE ATTACHMENT FOR TURNING IRREGULAR PROFILES Filed Dec. '7. 1926 3 Sheets-Sheet 5 I; GM Y Z kil Patented Oct. 25, 1927..

uurrro STATES 1,646,758 PATENT OFFICE.

Josnrei L. marrnnws. or HIGHLAND PARK, NEW mnsnv, assrenoa T INTERNA- TIONAL MOTOR. COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

LATHE ATTACHMENT FOR TURNING IRREGULAR PROFILES.

Application filed December 7; 1926. Serial No. 153,065.

The present invention relates to attachments for lathes to be used in turning irregular profiles.

In many instances, shafts of this type are turned instead of being drop'forged and the former methodoften involves removing a considerable amount of material. In existing methods, the removal of this material has required a relatively long time, due to '10 the limited depth of out which can be taken by agiven tool. v

An object of the present invention is the provision of an attachment for a lathe which is adapted to hold a plurality of tools and 1c feed them into the work simultaneously in order to divide the cut of a single tool into a plurality 01E smaller cuts The features of this design include a means for operating the tools simultaneously in radial directions with respect to the work and in this manner the shaft is made symmetrical with respect to its own axis.

A further object is to provide a means for steadying the work so that irregularities in the profile may be eliminated as far as possible.

Referenoe will now be hadto the accompanying drawings forming a part hereof for a more detailed description of the invention, wherein a i Figure l is an elevation of the lathe attachment showing the cutting tools and showing the pattern and guide means partly in section. 5' Figure 2 is a section on line 2-2 of Figure l 1 and looking in the direction of the arrows.-

- Figure 3 is a rear elevation of the attachment showing the means for steadying the work. Figure 4 is an elevation showing the side of the lathe and the pattern for positioning the tools and steadying means properly.

Figure 5 is a plan view showing the connection between the pattern track and the tool, or steadying mechanism. p In the drawings, a represents the attachment which is provided with a base portion a which is adapted to slide upon the bed of the lathe and be moved along the lathe by means of a lead screw a and a nut a The attachment consists of a body portion a provided with circumferential end flanges a to. which are bolted, end plates 0. Upon the outer side of one of these end lates are pivotally secured tool housings a y means in the housings, into which tools a may be.

' pivotally and the of semi-circular shouldered plates a Plates a are bolted to thefa'ce plates at a and. have shouldered portions a. The tool housings are pivoted tothe face plate by pins a which are secured b screws (1 and shoulders a prevent the ousings from bein removed by their engagement with shou ders a of the semi-circular plates: In order to secure a cutting tool, slots a, are provided adjusted by set screws a At each end of the body portion a an annular recess 6 is formed and adapted to receive an annular disc 6'.

Disc 6 is provided with three slots 6 "spaced equidistantly about the disc and receive rollers b which are carried by the tool, housings and suitably secured thereto. The end plates a are provided with slots 0" which permit a limited pivotal movement of the tool housing.

It will be seen that the tool housings are pivoted eccentrically with respect to the annular disc so that when the latter is moved within the recess the former will be moved rollers b will. ride within the slots 6. This relative movement. will cause the cutting. tool to be advanced into or withdrawn from the work, which isdesignated by the reference character '0.

In order to steady the work. and cause a more accurate cut, means is provided for steadying the work adjacent the cutting tools and comprises housings (2 similar to the tool housings and operated in the same manner. 9'0

Instead, however, of being provided with extensionsd which have heads d to'receive pins 01 at the inner ends of which are rollers (i which bear upon the work 0. Set screws 03 provide a means for adjusting the pins initially and are inounted in cover plates d upon the heads. It will beseen that the movement of the housings d, conforms to the movement of the annular ring which is moved in a manner to be described later.

In order to move the annular discs in ac-f cordance with a pattern to produce" a prede termjined profile, the following means is pro 105 vide i Brackets e are secured to the side of the attachnient and have formed therein vertical dovetailed grooves e which receive the dovetails 6 formed on movable heads a. These 110 central heads are, in turn, provided with dove tailed grooves e which receive the dove tails f of secondary heads 7. Vertical screws e in the heads e engage corresponding threads 7 in the secondary heads so the latter will be moved vertically in the dovetailed grooves e when the screws are turned. The secondary heads f. have formed therein longitudinal grooves f in which blocks 9 are adapted to slide.

Upon blocks 9 are pivotally mounted arms it which are secured to the respective rings 6' at each end of the body portion a*. When the heads e move slide in the grooves f to accommodate the relative movement of the arms k and blocks 9. Due to this relative movement, the rings will be turned and the tools and steadying rollers will be moved accordingly. An opening a is formed in the side of the body portion a to receive the arms 71. and permit their movement.

The outer faces of the heads 6 have se-.

cured thereto rollers e which ride in tracks 2' formed in a pattern plate 2" secured to the lathe. In order to retard the movement of the rollers so that they will be moved to conform with the "profile cut by the cutting tools, the track in which he roller 6 moves, which operates the annular disc of the steadying rollers, must be formed so that itsirregularities are spaced from those operating the cutting tools by a distance equal to that between the cutting tool and the rollers. This is representeddiagrammatically in Figure 4.

In order to adjust the positions of the tool housings and roller housin s initially, sleeves j are formed on the bracl iets e and receive shafts j which are provided with hand wheels 9' Formed at the other ends of these shafts are pinions 7' engaging gears 7' formed on the upper ends of the screws 6 A cylindrical sleeve k is placed in the body portion of the attachment to prevent foreign matter from falling therein and provide a portion to permit the work to pass therethrough.

The operation of the device will be evident from the above description.- The Work 0 is mounted between the tail spindle c and head stock 0 ment a. The lead screw a turns with the work and advances the attachment along the lathe. The advancing of the attachment causes the rollers a moving in the pattern tracks i to move the tools simultaneously into, or away from, the work to produce a desired profile. The cut is divided equally between the three toolsand enables a piece to be turned out with far greater speed than heretofore and with a much greater saving of the cutting tool.

ile a specific form of the invention has been described herein, it is obvious that the vertically the blocks 9 and passes through the attach-,

plates carried by device may be modified or changed in design without departing from the scope of the invention as set forth in the appended claims.

What- I claim is:

1. In an attachment for lathes, a body mounted to move upon the lathe, means to move the body, an end plate carried by the body, tool housings mounted pivotally upon the plate, tachment upon the side of the end plate opposite to the housings, slots in the disc, means carried by the housings to engage the slots, openings in the end plate to ,receive th engaging means, pattern means, and means to move the disc by the pattern in the movement of the attachment over the lathe.

2. In an attachment for lathes, .a body mounted to move upon the lathe,)means to move the body, an end plate carried by the body, tool housings mounted pivotally upon the plate, an annular recess in the side of the face plate nular disc carried in the recess, slots in the disc, pins carried by the housings and engaging the slots, openings in the'end plates to permit movement of the pins, pattern -means, and means to operate the disc by the pattern in the movement of the attachment.

over the lathe.

3. In an attachment for lathes, a body portion mounted to move upon the lathe, an end plate carried by the body portion, tool housings, means to mount the housings pivotally upon the outer side of the end plate, a semi-circular flange on the housings, semicircular shouldered plates secured to the faceplate and engaging the flanges of the housings, openings in the face plate, an annular recess in the inner face of the face plate, an annular disc carried in the recess, slots in the disc, pins carried by the housings and extending through the openings to engage theslots, a pattern track, an arm secured to the disc, and means for connecting the arm to the track to cause the housings to move simultaneously as the attachment movesalong the lathe.

4. In an attachment for lathes, a body portion mounted to move upon the lathe, en plates carried by the body portion, housings carried by each of the end plates, means opposite to the housings, an an-* an annular disc carried by the atto mount the housings pivotally thereon, I

means to mount cutting tools in the housings of one end plate, means to mount steadying means upon the housings of the other end plate, means to move the housings of each end plate simultaneously, and means to automatically operate the moving means of the steadying means in accordance with the movement of the cutting tools.

5. In an attachment for lathes, a body portion mounted to move upon the lathe, end the body portion, housings carried by each of the end plates, means to mount the housings pivotally thereon, means tilt eia-rte to mount cutting tools in the housings of one end plate, means to mount steadying means upon the housings of the other end plate, annular recesses in the rear faces of the end plates, annular discs carried in the recesses, slots in the discs, openings in the end plates, ins mounted on" the housings and extending through the openings and engaging the slots, a pattern track, a second pattern track similar to the first but having the configuration thereof lagging behind the corresponding configurations of the first track, means to move the ring associated with the tool housingsby the first track, and means to move the second ring by the second track, wheres by the work Will be firmly held adjacent the cutting tools.

6. In an attachment for lathes, a body portion mounted to move upon the lathe, end plates carried by the body portion, housings carried by each of he end plates, means to mount the housings pivotally thereon, means to mount cutting tools in the housings of one end plate, means to mount rollers upon the housings of the other end plate, means to adjust the rollers to contact with .the work, annular recesses in the rear faces of the end plates, annular discs carried in the recesses, slots in. the discs,openings in the, end plates, pins mounted on the housings andsextending through the openings and engaging the slots, a pattern track, a second pattern track similar to the first but having the configurations thereof lagging behind the corresponding configurations of the first track, means to move the ring associated with the tool housings by the first track, and means to move the second ring by the second track, whereby the work will be firmly held adjacent the cutting tools.

7. In an attachment for lathes, a body portion mounted to move upon the 'lathe, end plates carried by the body portion, tool housings, means to mount the housings pivotally upon the outer side of one of the end plates, housings, and means to mount the same pivotally upon the outer side of the other end plate, semi-circular flanges on the housings, semi-circular shouldered plates secured to the face plates and engaging the flanges of the housings, openings in the face plates, annular recesses in the inner faces of the face plates, annular discs carried in the recesses, slots in the discs, pins carried by the housings and extending through the openings to engage the slots, an opening in the side of the body portion, similar pattern tracks one of which is retarded with respect to the other, arms secured to the discs, an means for connecting the arms to the respective tracks to cause the housings to move simultaneously as the attachment moves along the lathe.

8. In an attachment for lathes, a body portion mounted to move upon the lathe,

means to move the body portion, a plurality of tool housings, means to mount the housings pivotally upon the attachment, cutting tools carried by the housings, a bracket carried by the body portion, a groove formed in the bracket, a head movable in the groove, a pattern track, means upon the head to engage the-track, and means connected to the head for moving the tool housing simul taneously.

9. In an attachment for lathes, a body portion mounted to move upon the lathe, means to move the body portion, a plurality of tool housings, means to mount the housings pivotally uponi the attachment, cutting tools carried by the housings, a bracket carried by the body portion, a groove formed in the bracket, a. head movable in the groove, a second groove formed in the head, a secondary head movable in'the second groove, means Fto adjust the position of the secondary head in the groove, a pattern track, means upon the head to engage the track, and means connected to the secondary head for moving the tool housings simultaneously.

10.' In an attachment for [lathes, a body portion mounted to move upon the lathe, meansto move the body portion, a plurality of tool housings, means to mount the housings pivotally upon the attachment, cutting tools carried by the housings, a'bracket carried by the body portion, a groove formed in the bracket, a head movable in the groove, a second groove formed in the head, a secondary head movable in the second-groove, ablock means secured to the block and housings for moving the latter simultaneously, a pattern track, andmeans mountedupon the head for engaging the pattern track.

11. In an attachment for lathes, a body portion mounted to move upon the lathe, means to move the body portion, a plurality of tool housings, means to mount the housings pivotally upon the attachment, cutting tools carried by the housings, 'a; bracket carried by the body portion, a groove formed in the bracket, a second groove formed in the head, a secondary head movable in the second groove, a block slidable longitudinally in the secondary head, an arm pivotally secured to the block, means secured to the block and housings for moving the latter simultaneously, a screw carried by the first head, threads in the secondary head engaging the screw, meansto turn the'screw, a pattern track, and

d means mountedupon the head for engaging the pattern track.

12-. In an attachment tor lathes, abody portion mounted to move upon the lathe, means to move the body portion, end plates secured to the body portion, a plurality of housings carried by each plate, means canhead movable in the groove, a.

ried by each plate for moving the-housings thereof simultaneously, cutting tools carried by the housings of one plate, steadying means carried by the housings of the other plate, a bracket having two armscarried by the body portion, a groove formed in each arm, heads movable, in the grooves, simimounted npon the lathe,

lar pattern tracks With respect to the other,

one being retarded JOSEPH L. MATTHEWS, [its] 

